Genuine OEM Audi Engine Roller Rocker Arm, part number 079109409B. This precision-engineered component is part of the engine's valve train, designed to transfer the rotational motion of the camshaft lobes to the engine valves. It ensures accurate and consistent opening and closing of the intake and exhaust valves, critical for engine combustion. Weighing approximately 0.079 kg, this roller rocker arm is built for high-stress engine environments. Choosing a genuine OEM roller rocker arm guarantees factory tolerances, material strength, and precise operation, which are vital for engine longevity and performance.